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~; <br />~..~ <br />=-- TUTTLE APPLEGATE RINDAHL, INC. <br />.= Consultants for Land and Resource Development <br />Mr. John Doerfer• <br />Mired Land Rec Lanrat ion Divisi.or+ <br />July "c'c, 1988 <br />Pace 7 <br />In s+.xmntary t~~ p+~ints a. through h. we +~ffer the f•~llowing: <br />a. If it 6ecorees apparent that the proposed mininb piarr <br />needs t+~ leave m+~re sanO in the stream bottom than is <br />proposed, the ntinYng dlan will be modifieU and t;hc <br />depth +~f mining will be reduced. <br />6. We expect to Leave a consider^able <br />the b•~ttom •~f the channel as <br />nunter•o+.xs areas where the depth of <br />We cannot reasona63y agree <br />substrate, but will agree to r~laci <br />the material as is practicable. <br />maintainer. <br />amount of sand alonc~ <br />pr^oposed. There ar•e <br />sands reach ,'~~d feet. <br />t~~ leave a +.~nifor•nt <br />_ sand on the too of` <br />Fl sand channel can be <br />c. Reject Pines w1II be placed al.~ng channel banLcs as 1s <br />pr^act ical. Fines placed in the channel bottom will bf::a <br />buried using sand material moved fi^ont one phase to the <br />pr•evio+.~s phase w•~rketl. <br />d. The p~~ckets of excavation have been removed. <br />e. We conc+_ir that these fords sho+ald serve as c•~ntr•ols. <br />The design will be based on passing a 1~D year flo+~d <br />w ith•~+lt tlareabe. <br />f. A drop str•uct+are is propt~sed at the ubst ream end of the <br />pr•o~ect. <br />g. At present, a design f~~r the b•~st mining ch ar~nel is not <br />easily •~btainable. There is rn+~ detailed top.~cr^aphy ot~' <br />the area, depths of sand dep•~sits are unknown, and the <br />ntonit+~r•ing plan we have proposed might r•eauir•cr <br />alterat i•~n of the final channel. We have prepared <br />cross sect i+~ns in var-io~ys lecat ions and have done:> <br />hydraulic calculations suYf icient t~-+ determine minim+_im <br />widths of channels, locati•~ns or erosion c+~ntr•+al <br />st ruct ores, and pr^el intiriar^y design sl+~oes. <br />h. The disc+.ission presented in this letter r•ep•~r•t sho+a lc:l <br />adeq+.~ately cover the subjects listed. <br />